English verb conjugation
CAN PIPE

Regular verb: pipe - piped - piped

Affirmation

Simple form	V-ing form
I can pipe you can pipe he can pipe we can pipe you can pipe they can pipe	I can be piping you can be piping he can be piping we can be piping you can be piping they can be piping
Perfect	V-ing perfect
I can have piped you can have piped he can have piped we can have piped you can have piped they can have piped	I can have been piping you can have been piping he can have been piping we can have been piping you can have been piping they can have been piping

Negation

Simple form	V-ing form
I can't pipe you can't pipe he can't pipe we can't pipe you can't pipe they can't pipe	I can't be piping you can't be piping he can't be piping we can't be piping you can't be piping they can't be piping
Perfect	V-ing perfect
I can't have piped you can't have piped he can't have piped we can't have piped you can't have piped they can't have piped	I can't have been piping you can't have been piping he can't have been piping we can't have been piping you can't have been piping they can't have been piping

Interrogative form

Simple form	V-ing form
can I pipe? can you pipe? can he pipe? can we pipe? can you pipe? can they pipe?	can I be piping? can you be piping? can he be piping? can we be piping? can you be piping? can they be piping?
Perfect	V-ing perfect
can I have piped? can you have piped? can he have piped? can we have piped? can you have piped? can they have piped?	can I have been piping? can you have been piping? can he have been piping? can we have been piping? can you have been piping? can they have been piping?

Interro-negative form

Simple form	V-ing form
can't I pipe? can't you pipe? can't he pipe? can't we pipe? can't you pipe? can't they pipe?	can't I be piping? can't you be piping? can't he be piping? can't we be piping? can't you be piping? can't they be piping?
Perfect	V-ing perfect
can't I have piped? can't you have piped? can't he have piped? can't we have piped? can't you have piped? can't they have piped?	can't I have been piping? can't you have been piping? can't he have been piping? can't we have been piping? can't you have been piping? can't they have been piping?